p核光中子反应截面和极化角分布实验研究

本项目将开展核天体物理中p核及其同位素链的光中子截面和极化角分布的实验研究，特别是Sn,Er,Dy等同位素核的测量；在上海光源的康普顿散射源（SLEGS）线站上，采用平坦效率中子探测器和飞行时间中子探测器，通过光中子截面及伽玛极化角分布的测量，提取伽马强度函数，角分布特征和核能级结构等参数，推广到实验上难于测量的同位素丰度极低或者非稳定核素的截面计算和理论验证；通过对p/g-process过程相关核素的光中子截面和极化光子角分布的研究，提供核天体物理所需的关键核物理参数，对于研究宇宙演化过程中的重元素丰度起源，了解宇宙的演化及核合成过程具有重要的意义。

The photoneutron cross section of p-nuclei and it’s stable isotope in nuclear astrophysics and nuclear structure will be studied in experiment,based on the shanghai laser electron gamma source(SLEGS),the gamma strength function, angular distribution,nuclear structure information and GDR parameters will be extracted from the photo-neutron cross section and neutron polarized angular distribution experimental data. and extend to other isotopes which have very low abundance or unstable nuclei cross section for calculation and verified. Using flat efficiency neutron detector array and neutron TOF detector array to measured the GDR （g,xn）cross section and polarized gamma neutron angular distribution. Photo-induced reactions play a key role in production of heavy neutron-deficient nuclei and p/g-process related nuclei, these study will be very important to the cosmic evolution and nucleosynthesis.